Yep, max should be 525. There's a couple of dragons I've stumbled upon on character pages with >825 HP as well. Could be a relic of pet training before some code changes, or maybe the spawning ranges were adjusted shortly after launch... I have no idea, I joined this shard about a year after these pets were born!
I could have sworn he spelled it wrong, like Radaghast, a long long time ago. There's no chars with that name anymore though. Considering the style of attire, I'll assume this is likely him: http://www.uorenaissance.com/player/30347 Not the one that's in O^S edit: LOL @ 7x (minus 0.5 Resist on Pestilence) unbonded 130 dex WWs. hahahahahaha well played Sandrekiel. Well played.
I believe a few people have got 7x dragons/wyrms before the extra bonded slots were added. I know I did and pretty sure Dalavar did as well.
I did it with a dragon, which starts with much lower stats than a wyrm. I'm all for calling people out on their nonsense (see above with 531 HP Nightmare), but there's no smoking gun here. It's not like it's a 760/760/130/425 or whatever. If you're just looking for max dex, it's a 1/30 chance. You'd find two of them faster than you'd find an albino wyrm for the tamer quest these days.
Good lord, lighten up. It's just highly uncommon to see two peak dex WWs, that well trained, unbonded. Sheesh, take a pill or something folks. hahahah
So far this is the best wyrm I've fount : http://www.uorenaissance.com/pets/147336 Im still looking for 1 more somewhere near this- paying top notch!